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hachau3107
2 năm trước
bài 1 cho biết 15kg cát có thể tích là 10 lít . khối lượng riêng của bao cát là bao nhiêu bài 2 cho biết 5 lít xăng có khối lượng là 3,5kg . hãy tính khối lượng riêng và trọng lượng riêng của xăng
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